Good to get involved again: it should bear fruit (9)
I believe the answer is:
greengage
'fruit' is the definition.
(type of plum)
'good to get involved again it should bear' is the wordplay.
I cannot quite see how this works, but
'good' could be 'g' (abbreviation) and 'g' is found in the answer.
'get' could be 'engage' (engaging is a kind of getting) and 'engage' is present in the answer.
'again' could be 're' (prefix meaning 'again') and 're' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for greengage that I've seen before include "Plum-like fruit" , "Fruit like a small plum" , "Greenish-yellow type of plum" , "Garden fruit" , "Fruit tree" .)